diff --git a/game_state.h b/game_state.h
index 350924c..3c65771 100644
--- a/game_state.h
+++ b/game_state.h
@@ -161,6 +161,7 @@ public:
     [[nodiscard]] virtual hand_index_t find_card_in_hand(const Card& card) const = 0;
     [[nodiscard]] virtual bool is_trash(const Card& card) const = 0;
     [[nodiscard]] virtual bool is_playable(const Card& card) const = 0;
+    [[nodiscard]] virtual size_t draw_pile_size() const = 0;
 
     [[nodiscard]] virtual std::uint64_t enumerated_states() const = 0;
     [[nodiscard]] virtual std::unordered_map<unsigned long, double> visited_states() const = 0;
@@ -194,6 +195,7 @@ public:
     [[nodiscard]] hand_index_t find_card_in_hand(const Card& card) const final;
     [[nodiscard]] bool is_trash(const Card& card) const final;
     [[nodiscard]] bool is_playable(const Card& card) const final;
+    [[nodiscard]] size_t draw_pile_size() const final;
 
     [[nodiscard]] std::uint64_t enumerated_states() const final;
     [[nodiscard]] std::unordered_map<unsigned long, double> visited_states() const final;
diff --git a/game_state.hpp b/game_state.hpp
index 5379a6d..1ac87db 100644
--- a/game_state.hpp
+++ b/game_state.hpp
@@ -554,4 +554,9 @@ namespace Hanabi {
         return _position_tablebase;
     }
 
+    template<suit_t num_suits, player_t num_players, hand_index_t hand_size>
+    size_t HanabiState<num_suits, num_players, hand_size>::draw_pile_size() const {
+        return _weighted_draw_pile_size;
+    }
+
 } // namespace Hanabi
\ No newline at end of file